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Dark Novel, Born Evil, Decisive in Killing, No Virgin, No Heroine, No Ambiguity

I want to read a book like "After I Killed the Protagonist's Family, I Became His Inner Demon". The Lone Ranger, the protagonist is always alone, and there must be no weakness in the heroine's sister, family, anti-social, high IQ, pleasure-seeking, ignorant of human life, elegant and polite, selfish and indifferent, extremely